Island



(No Model.)

a 2 Sheets-Sheet 1. N. G. HERRESHOFF. ATTACHMENT FOR STEAM BOILERS. No. 600,223.

Patented Mar. 8, 1898.

x we I" a WITNESSES: I gf QNQLL we. ,Qfi BY ATTORNEY (No Model.) 2 S11eets+-Sheet 2.

N. G. HERRESHOFP. ATTACHMENT FOR STEAM BOILERS.

No. 600,223. Patented Mar. 8, 1898.

UNITED STATES PATENT met;

NATHANIEL GREENE HERRESHOFF, OF BRISTOL, RHODE ISLAND, ASSIGNOR TO THE IIERRESHOFF MANUFACTURING COMPANY, OF SAME PLACE.

ATTACHMENT FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 600,223, dated March 8, 1898. Application filed August 11, 1897. fierial NO- 647,810- (NO model.)

To ctZZ whom it may concern: I cylindrical. It may be understood to be the Be it known that I, NATHANIEL GREENE main body or supporting-chamber of a sec I-IERRESHOFF, a citizen of the United States, tional boiler having water-tubes below. (Not residing at Bristol, in the county of Bristol shown.) It is important that the water-level 5 and State of Rhode Island, have invented a be maintained at about the position indicertain new and Improved Attachment for cated. A casting A is fitted'on the interior Steam-Boilers, of which the following is a of theboilersurroundingthefeed-water aperspeciflcation. ture a and presenting a suitable seat for a I operate a valve by means of a float supdisk or puppet valve opening inward, to be IO ported on the water in the boiler and thereby described farther on. A sectorshaped or restrain the admission of the feed-water with conical chamber A is fitted on the outside, a yielding force which increases as the waterinto which a feed-pipe O connects. level in that boiler rises. It is intended more B is a float, and B alever extending out particularly for use in sets of two or more through thesufficientlycapacious feed-orifice I5 boilers supplied by a single feed-pump or a and carryingaweight B on or near its outer analogous water forcing device. The arend. This lever turns on a center I), to which rangement allows the valve to serve also as a it is connected by an inclined arm B The check-valve. Thefloatis connected bymeans lever is provided with a spherical shoulder i of a lever turning on a center near the orifice B' at a point nearly abreast of the axis of 20 through which the feed-water is admitted. motion 1) and receives on that shoulder a The buoyancy of the float is aided by a weight loosely-mounted disk valve D,which is adapt on the opposite arm of the lever extending ed to close tightly against the seat on the inout through the feed-orifice and inclosed withnor face of the adjacent casting A. The cen- 7 5 in a suitably-formed chamber exterior to the ter 1) is nearly frictionless and presents but 25 main cylindrical portion of the boiler. WVhen little resistance to the motion of the lever B, the apparatus is working in the ordinary withits attachments. The feed-water should manner and the feed-pump is supplying feed, be supplied constantly at a pressure which is this chamber is filled with water at a prescapable of rising somewhat above that in the sure a little above that in the boiler. The interior of the boiler. Its pressure against 30 valve resists the feed with a moderate presthe valve D tends to open it inward, thereby sure if the water is high and opens to allow a tilting the lever B and depressing the float 13 free flow if the wateris low. It should be and raising the weight 13 Any change in understood that all the boilers fed are dis the level of the water varies the condition in charging steam into the same main and are this regard. A sinking of the water-level al- 3 5 subjected to about the same steam-pressure. lows this motion to proceed further and the The accompanying drawings form a part of valve D to open farther, admitting the feedthis specification and represent what I oonwater more freely, and a rising of the watersider the best means of carrying out the inlevel rocking the lever B in the opposite di- 0 vention. rection and partially closing the valve D and 40 Figure 1 is an end elevation of a series of thereby obstructing the admission of the boilers arranged side by side and provided Water. with my attachment andsupplied by branches \Vhcn the invention is applied to a series from a single feed-pipe. Fig. 2 is a vertical of boilers side by side or to a series of sec- 5 section showing the water low and the feed tions in a sectional boiler, which sections I 5 being admitted freely. Fig. 3isacorrespondwill refer to as boilers, each is provided ing section showing the water high and the with my invention and the several feed-pipes admission of feed subjected to increased re- 0 are connected together and supplied by a straint by the partial closing of the valve. single feed-pump F. WVhen by reason of an Similar letters of reference indicate correinclination of the vessel on which the boilers 5o sponding parts in all the figures Where they are used or for any other cause the waterappear. level rises in the lowermost boiler or in any A is a portion of the boiler, represented as one of the series, the valve D in that boiler will be more nearly closed than the corresponding valve in each of the other boilers, so that no boiler will receive an excess. When the water-level is sufficiently raised in all the action in the rare cases where such valve is required to serve as a check-valve to arrest a flow'of Water or steam in the opposite direction.

When from accident or other cause there might be liberty for the water and steam from the boiler to escape through the feed apparatus, the pressure of the water inward against the valve D being stopped, the pressure of the water and steam in the interior of the boiler forces the valve outward, the buoyancy of the float B and the gravity of the weight B being reinforced immensely by the pressure of the steam, so that the valve is certain to press fairly and tightly on its seat A. .When this occurs, the float will rise a very little higher than is shown in Fig. 3, the float being raised higher even if the waterlevel is low and the valve D being forced into tight contact with its seat A.

Modifications may be made without departing from the principle or sacrificing the advantages of the invention. Parts may be used without the whole. In some cases it may be expedient to have the valve D fixed rigidly on the lever B, taking care to confine it, so that it will bear fairly when closed. Such a modification would decrease the number of joints and loose parts. Other modes of allowing the valve a little looseness may be employed. The shoulder at B may be a partial cylinder instead of a partial sphere. The boilers may be arranged otherwise than side by side. The invention may be depended on to maintain about the proper quantity in each if there is considerable difference in the level of the second boiler of a set.

I claim as my invention-- 1. In combination with a steam-boiler A and feed-pipe O, a valve D having an interior resting on the boiler-shell and arranged to be opened by the force of the entering water and to restrain its entrance with varying force according as its position is changed, and a float B connected thereto through a lever B extending both within and outside of the boiler and turning on a center I), and a weight B adapted to promote the closing movement of the valve, the valve being governed by the rising and sinking of the water-level, requiring but little buoyancy in the float, all substantially as herein specified.

2. In combination with a steam-boiler A, and feed-pipe O, a valve D having an interior resting on the boiler-shell and arranged to be opened by the force of the entering water and to restrain its entrance with varying force according as its position is changed, a lever B extending both within and outside of the boiler and turning on an adjacent axis or center I), and a lever or universal joint B connecting the valve to such lever with liberty to allow it to accommodate itself to its seat, so as to close it and serve as a check-valve when required, and a float B connected thereto and affected by the rising and sinking of the water-level, all substantially as herein set forth.

3. In combination with a steam-boiler A and feed-pipe O, a valve D having an interior resting on the boiler-shell and arranged to be opened by the force of the entering water and to restrain its entrance with varying force according as the position is changed, a float B connected thereto through alever 13 extending both within and outside of the boiler and turning on a center I), a weight B adapted to promote the closing movement of the valve, and a chamber A on the exterior of the boiler inclosing the weight with liberty for its motion and subject to'the pressure in the connected feed-pipe, all adapted to serve substantially as herein set forth.

4. In combination with a steam-boiler A, chamber A, and feed-pipe C, a valve D, having an interior seating on the boiler-shell, a lever B turning on an adjacent center or axis 19, said lever passing through the valve and extending both into the boiler and chamber A, a float B on the lever within the boiler, and a weight on the said lever within the chamber A, the arrangement being such that the valve will be seated by forces operating both within and externally to the boiler, substantially as herein specified.

5. In combination with a steam-boiler A, chamber A and feed-pipe 0,.a valve D having an interior seating on the boiler-shell, a float B mounted on a lever B turning on an adjacent center or axis 1) and provided with a conical shoulder in free bearing contact with a corresponding recess in the valve, said lever passing through said valve and extending both into the boiler and chamber A, a weight B on the said lever within the chamber A, the arrangement being such that the valve will be seated by forces operating both within and externally to the boiler, substantially as herein specified.

In testimony that I claim the invention above set forth I affix my signature in presence of two Witnesses.

NATHANIEL GREENE HERRESHOFE.

Witnesses:

O. W. YOUNG, H. T. CARD. 

